Multiple choice

A mixture contains 80% acid and rest water. Part of the mixture that should be removed and replaced by the same amount of water to make the ratio of acid and water 4 : 3 is : एक मिश्रण में 80 % अम्ल है और बाकि पानी है . तो मिश्रण से कितना भाग निकाला जाये और समान मात्रा मे पानी मिलाया जाये की मिश्रण में अनुपात 4 : 3 हो जाये ?

  1. 1/3

  2. 3/7

  3. 2/3

  4. 2/7
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let initial mixture be 100 units with 80 acid. If x units removed, acid remaining = 80(1 - x/100). After adding x water, total = 100. New ratio acid:water = 4:3, so acid = (4/7) × 100 = 57.14. 80(1 - x/100) = 57.14 gives x ≈ 28.57, which is 2/7 of 100.

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